let current_lang = ''
//let debugserver = 'http://192.168.0.22';
let debugserver = ''; 

function lang_load() {    	
    return lang_change();
}

function get_lang() {
    return new Promise((resolve, reject) => {
        let send = { cmd: 'getlang' };
        console.log(send);

        $.ajax({
            url: debugserver + '/api',
            type: 'POST',
            contentType: "application/json",
            dataType: "json",
            data: JSON.stringify(send),
            success: function(json) {
                console.log("done", json);
                if (json.result) {
                    resolve(json.lang);
                } else {
                    reject(new Error('Request failed with result false.'));
                }
            },
            error: function(error) {
                console.log("error::::", error);
                reject(error);
            }
        });
    });
}

function getTitle() {
    return fetch('title.txt')
        .then(response => {
            if (!response.ok) {
                throw new Error("HTTP error " + response.status);
            }
            return response.text(); 
        })
        .then(data => {
            return data.trim(); 
        })
        .catch(error => {
            return null; 
        });
}
async function lang_change() {
    if (current_lang === '') {
        try {
            current_lang = await get_lang();
        } catch (error) {
            current_lang = 'en';
            console.error('Error getting language:', error);
        }
    }

    let langJs = current_lang;
    $.cookie('lang', current_lang);
    console.log("language:", langJs);
	let title = await getTitle();
    return new Promise((resolve, reject) => {
        $.ajax({
            url: "resources/lang/" + langJs + ".js",
            dataType: "script",
            async: false,
            success: function() {
                window.lang = lang;
				if (title !== null&&title!='') {
                    window.lang.UISTR_AI_BIO_ID_SYSTEM = title;
                }
                $('.lang').each(function(idx, ele) {
                    let key = ele.getAttribute("key");
                    let value = lang[key];                    
                    if (typeof(value) !== "undefined") {
                        $(this).text(value);
                    }
                });
                console.log("reload to refresh lang");
                resolve();
            },
            error: function(error) {
                console.log("error lang", error);
                reject(error);
            }
        });
    });
}